Grinding-wheel-trimming mechanism.



F. A. WARD. GRINDING WHEEL TRIMMING MECHANISM.

APPLICATION FILED JAN. 20, 1909. I

Patented Mar. 23, 1915.

3 SHEETS-SHEET 1.

INVENTOR.

WITNESSES.-

F. A. WARD. GRINDING WHEEL TRIMMING MECHANISM.

APPLICATION FILED JAN. 20 1909.

' Patented,Mar.23, 1915.

3 SHEETS-SHEET 2.

ND INVENTOR.

WITNESSES-I 60 5% M WM F. AJWARD.

GRINDING WHEEL TRIMMING MECHANISM.

APPLICATION FILED JAN.20, 1909.

Patented Mar. 23, 1915.

3 SHEETS SHEET 3.

\NVQNTOR; JMM a M WWW,

WITNESSES: $61M v TQ all whom it may FREDERICK A. ,NVARD,

F DETROIT, MICHIGAN, ASSIGNOR TO THE GEAR GRINDING MACHINE COMPANY, 'OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

GRINDING WHEEL-TRIMMING MECHANISM.

concern: Be it known that I, FREDERICK A. WARD, a citizen of the United States, and'a resident of Detroit, in the county of Wayne and State of Michigan, have invented a certain new and useful Grinding-Wheel' Trimming Mechanism; and I do hereby declare the following to be a full, clear, and exact dscnptionj of the invention, such as -willenable Others skilled in the art to which it -appertains to make and use the same, reference beinglhad to the accompanying drawings, and to 'the' figures of reference'marked thereon, which-form a part of this specification.

This invention relates to mechanism for truing the operating surfaces of grinding- .wheels or the like, to maintain such surfaces uniform for successive operations, and has particular reference to improvements on the mechanism shown and described in the United States Letters Patent No.-888,675, granted jointly to William N. Taylor and myself on May 26, 1908.

An object of my invention is the provision in-a machine of this class of simple and efficient means for automatically controlling \themovements of the wheel-trimming members tocausethe working surfaces of the wheel to be shaped to 'suit the surface to be ground, which means is capable of-being removed to permit the substitution therefor of similar means of different shape .whereby the. machine may be easily and quickly changed to maintain thework-in-g surface of.

a grinding-wheel in any predetermined-form lasthe shape or size of the surfaces-to be ground may require.

A further object of my invention isto improve upon the construction and arrangement of the parts of. the mechanism described in said Letters PatentNo. 888,675,

whereby to increase the working efficiency,

practicability, and commercial value of the machine, as will hereinafter be more fully explained.

The invention is fully described in the following specification, and while in its broader aspect it may be embodied in diflerent forms of machines and its parts differently arranged and constructed, a preferredform is shown. in .the accompanying drawings, in which,- I

Figure 1 is a side elevation of a machine embodying the invention. Fig. 2 is en- Specification of Letters Patent.

Application filed January 20,

and controlling parts.

Patented Mar. 23, 1915. 1909. Serial No; 473,251.

larged side elevation of the trimming mechanism and associated parts, with the rear trimmer members in elevated position and with portions of the frame in section. Fig. 3 is an enlarged froht elevation of such mechanism with portions of the frame in section. Fig. 4 is an enlarged plan view thereof with a portion of the frame or housing in horizontal section, and Figs. 5, 6 and 7 are enlarged rear, plan and side views of portions of the mechanism employed for trimming the side surfaces of the grindingwheel. I

Referring to the drawings, 1 designates the frame", which is provided at one end with the elevated portion 2 carrying the grinding parts, and at the otherlend with the elevated portion The frame part 2 is formed on its top with a slide-Way on which a carriage 4, carrying the grinding-wheel 5 at its forward end, is slidinglymounted to 3 carrying the work-mandrel enable such Wheel to have movements transf versely of the gear or other work 6 to be No. 888,675. As the mechanism employed for lowering the grinding-wheel 5 after each grinding operation to compensate for wear and for the material removed from its work- 'ground, as is fully described in said Patent ing surface by the trimming process forms no part of the present invention, reference is made to said former Letters Patent for a description of the same.

The carriage 4 has its reciprocatory movements actuated by the rotation of a camdrum 7 which is mounted on a shaft 8 Within the portion 2 of the frame, and has its periphery provided with a cam-groove 9 in which operates a roller 10 carried by a stud projecting downwardly from the car-.

riage 4. v shaft 8 in any suitable manner. b Supported by the frame 1 in advance of the elevated portion 2 and beneath the grinding-wheel 5 when-in retracted position,

as shown in the drawings, is a frame part 11, which carries the trimmer mechanisms. Rising from the rear of this frame part is the rear trimmer-head supporting-standard 12, on the top of transversely adjustable blocks 13, 13, which preferably have their bottoms grooved to work over a tongue or rib formed on the standard top, a s shown in Fig. 2, and are Rotation is communicated to, the

which are moimted the two i disposed between and abutting against the inner ends of such blocks. A plurality of these pins having. their heads of varying thicknesses may be provided to adapt them to be used to hold the blocks in various positions of relative adjustment.

Mounted on a stud 17 projecting forwardly from each block 13 is one of a set ofvertically-disposed levers 18, 18, each of which has its upper end disposed contiguous to a lower side edge of the grinding- 0 wheel and enlarged longitudinally of the plane of movement of such wheel to form a bearing-head 19,.in which a short shaft 20 is mounted, as shown. Each-of the shafts 20 has its forward end preferably enlarged, as shown, and provided with a transverse opening in. which a trimmer-finger 21 is mounted for longitudinal adjustment and secured in adjusted position by a set-screw 22. Arms 23, 23 project downwardly and inwardly from the rear ends of the shafts 20, 20 and are provided at their free ends with laterally-pro ecting studs 24, 24, which work in a slot 25 provided transversely in the upper end ofthe vertical push-rod 26, see Figs. 5, 6 and 7, thus adapting a vertical movement of such rod to eii'ect a rocking of the arms 23, 23, shafts 20, 20 and trimmer-fingers 21, 21. I

The push-rod 26 projects downwardly through the standard 12 and top of the frame part'll and is yieldingly held inlowered position by a coiled expansion-spring 27 which encircles it within said standard and has opposite ends thrust-against the under 45 side of the standard top and a pin 28 carried by the rod, as shown inFigs. land 2. The rod 26 is raised against the tension of the spring 27 by the rocking of an arm 29, which projects horizontally from a rockshaft 30 and has its free end forked to Work over a .pin "31 at the lower end of the rod. The shaft 30 is j ournaled transversely of the machine insuitable bearings provided in the frame part 2, as shown in Fig. -4,=and carries a downwardly-projecting arm 32 at its outerend, the-lower end-bf 'tvhichflis forked to. engage over-a pin 33 projecting laterally from a horizontal push-bar 34, which is mounted iii-bearings 35 at one side pf thev machine, as shown in Figs. 1 and 2. The forward movements offthe push-bar 34 are caused ,by'. the forward rocking move- -ments of a rockerrarm- 36, whichis carried at one .end ofa rock-shaft 3'? with its upper 665 or' freeendin position to have contact with the rear side of a roller or projection38 on the side of such bar. The shaft 37 is journaled in the frame 1 transversely thereof and beneath the forward end of the drum 7, and carries an arm 39 which projects upwardly 7@ in .the path'of forward movement of a pin 40011 the sleeve 41. This sleeve is carried by a shaft 42, mounted longitudinally of the frame beneath the drum 7, and has movements imparted thereto longitudinally of the 7 shaft 42 due to a roller 43 on its top worL- ing in the cam-groove 9 of the drum, as shown in Fig. 2.

I In order to cause the trimmer ends of the trimmer-fingers 21, 21 to describe irregular 8Q curves. or lines of predetermined shape when such fingers are rocked by oscillations of their respective carrying-shafts 20, 20, the levers 18, 1.8"carry at their lower ends inwardly-projecting pins 44, 44 which abut attheir inner ends against the opposite sides ofa form or templet 45, which is mounted on a spindle projecting upwardly from the upper end of a verticallymovable push-rod 46, said pins being yieldingly held in contact with the templet surface by the action of a contraction-spring 47 on said lever. It is thus evident that a vertical movement of thetemplet 45 relative to the levers 18 simultaneous with a rocking of 5 shafts 20, 20 will impart opposed oscillatory movements to such levers and effect irregular movements of the trimmerends of the fingers 21,21 relative to the grinding-wheel while such finger-ends are moving in the arcs of circles concentric to their respective axes,thus causing the templet and levers to coiiperate with the. shafts 20, 20 and their operating ,mechanism to communicate the requisite compound oscillatory movements 5 to the trimmer-fingers to shape the operating surfaces of the grinding-wheel toisuit the work. operated on. A templet 45 may be retained on its carrying spindle by threading a nut 16 to the upper end of such spindle, thus enabling a templet to be easily removed and one of proper shape to suit the contour or size of the work to be operated on substituted therefor.

The'templet rod orholder 46 is mounted for vertical reciprocatory movements in a bearing 48- formed through the top of the frame part-.111, and has its lower fend forked Ti and carryin a pin 49 with which the forked era of a rofrer arm 50 engages, as shown in 120 Figs. 1, 2 and 3 The arm 50 is shown as projecting rearwardly from a shaft 51, which is mounted transversely of the frame 11 in suitable bearings provided therefor, 'and earries a vertically projecting arm 52 12.5 at one end. -Thej forward end of the pushbar 34 is-intended to coact with an antifriction roller 53 carried by thearm '52 to "effect a forward oscillation of such arm and 'aconsequentrocking of the shaft 51 to raise the free end of the arm 50 and tem' let-rod 46 when such push-bar is moved orward as hereinbefore' described. 'A contractionspring 54 yieldingly acts on an arm 55 projecting upwardly from the shaft 51 and on a pin 56 (Figs. 3 and 4) pro]ect1ng mw ardly from a side of the frame part 11 to normally maintain the shaft 51 andits arms and the push-bar 34 in the position shown in Fig. 1.

Rising from the top of the frame part 11 atone side thereof and in advance of the rear trimmer mechanism is a standard 57 having the head 58. Mounted within this head for horizontal movements transversely of the machine is a bar 59, one end of which projects from such, head in contlguousposition to the lower edge of the grindingwheel 5 and is vertically apertured to re-' vertical push-rod 62 is mounted in the standard 57 and has its upper end narrowed'to work through 'a slot 63 '(Fig. 1) in the bar 59 and tapered, as shown by dotted lines in Fig. 3, to v coact with a roller 64; disposed within said slot whereby an upward move ment of such rod will impart a trimming; movement to the bar 59 and its attached trimmer-finger 60. A coiled compressionspring 65 is mounted in asocket 66.provided in the head 58 at one side of the bar 59 and acts against the inner end of the socket and a thrust-pin 67, which latter projects within the open end of such socket and is attached to the bar 59, whereby to effect a retraction of the bar 59 to its normal position on a lowering of the push-rod 62.; The raising movements. of the push-rod 62 are intermittently caused by a rocking of the rocker-arm 68, which has its free end in forked engagement with a pin 69 at the lower end of such rod and is'carried by a rock-shaft70, see Figs. 2 and 3. Ilhis shaft is mounted in suitable bearings longitudinally of the frame and carries an' arm 71 at its rear end, which is rocked at a predetermined point in each revolution of the drum 7 by contact therewith of a stud 72, which projects from the forward end of said drum, as shown in Figs. 2, 3 and/1.

The engagement of the stud 72 and arm 71 stands approximately in transverse felinement with the trimmer-finger 60,

73 designates an arm which iscarried by the rock-shaft 30 andis connected by a-rod 74 to the mechanism controlling the mOyQFm: ments of the work, whereby such mecha-f nismat each rocking movement of said arm is actuated to move the work far successive operations, as is fully described in said former Letters Patent No. 888,675.

The operation of my improved machine isas follows :'The drum 7 being set in motlon the grinding-wheel 5 is moved forwardly across the work and then returned tothe position shown in the drawings due to the roller 10 and its carriage 4 working in the cam-groove 9 of the drum, which groove is suitably fashioned for such purpose, and at a point in the returning move ment of the wheel it is lowered a predeten. mined distance, by mechanism not described herein, to compensate for wear and for the material removed therefrom in the trimming process. When the sleeve 41, which is also reciprocated the drum 7, is near the limit of its forward movement the grindingwheel carriage has reached its limit of rearward movement and pauses, due to the roller 10 working in a neutral zone of the grooveat such point, until the sleeve 41 completes its forward movement. During thlspause of the grinding-wheel and the continued forward movement of the sleeve 41, the pin 40 thereon engages and effects a rocking of the arm 39, shaft 37, and attac ed arm, 36, thus effecting a forward movement of the push-bar 34: As the pushbar 34 moves forward it effects a simultaneous rocking of the rock-shafts 30 and 51 through the medium of the respective arms 32 andv 52 with which it contacts and a consequent raising of the two push-rods 26 .trimmer ends are caused to have a movement other than the arc of a circle relative to the grinding-wheel rim, whereby to trim the opposing operating surfaces a a of the wheel in predetermined forms, due to the oscillatory movements imparted to the levers 18, 18 carrying the finger-shafts by reason of the movement imparted to the templet or form 45 with which the lower ends of such levers have contact. It is thus apparent that the working surface of the grinding-wheel may be trimmed in any desired form to suit the shape of the surfaces operated on by simply placinga templet of the required shape on the spindle of the push-rod 46. The side surfaces a at having been trimmed the cam-groove ofthe drum acts on the carriage-roller 10' to move the carriage and grinding-wheel forward to operate on the work. When the wheel has reached-a point in its forward moven'ient in which its axis stands approximately in a transverse vertical plane with the front trimmer finger 60, the'stud 72 on the edge of the drum 7 moves in contact with and rocks the, arm 71 on the rock-shaft 70, thus effecting an upward movement of the pushrod 62, and a consequent horizontal movement of the trimmerfinger 60 across the lower peripheral edge of the wheel in'contact therewith to trim such edge, due to the upper beveled end of the rod 62 coacting with the roller 64- which is mounted in the finger-carrying bar 59. \Vhen the rod '62 is again lowered the bar 59 is retracted to its normal position by the action thereon of the compression-spring 65. In adapting the machine for operating on work of different shape or size from that previously operated on, a grinding-wheel of the requisite shape is placed on the carriage & vand the. blocks 13, 13 carrying the levers 18, 18

"are suitably adjusted on the standard 12 and secured in adjusted position by a tightening of the screws 14, 1 1 and inserting a spacing pin 15 between their contiguous ends, which pin has its head of proper size to rigidly'space the blocks apart. This being done, a templet of the desired form is placed on the push-rod 46, and the machin is then readyior operating. 1 \z I desire it to be understood that my invention is not limited to any specific form .orarrangement of parts except in so far as such limitations are specified in the claims. Having thus 'descrlbed my lnventlon, what I clalm as new and desire to secure by Letters Patent, is,--

, parts.

3. In a machine of the class described, the combination. of a grinding-wheel, wheel trimming means having trimmer parts capable of like compound oscillatory trimming movements in unison and mechanism for intermittently causi'n'gQsuch movements of said parts.

- In a machine of the class described, the combination of a grinding-wheel, an ,oscillatory part movableto radially trim a side edge of-the wheel, and mechanism for imparting oscillatory movements to said partand lateral movements to its axis whereby to cause said part to have irregular trimming movements and means for causing the irregular movements of such part.

5. The combination with a grindingwheel, of an oscillatory member, a wheel means for oscillating said members when the trimmer parts are oscillated relative thereto. i

7. The combination with a grindingwheel, of an oscillatory member, an oscillatory wheel-trimming part carried by said member with its axis parallel thereto and "capable of trimming movements relative to such member and mechanism operative to impart relative simultaneous movements to said member and part.

8. The combination with a grindingwheel, of a set of movable members, wheeltrimming means carried by said members for trimming movements relative thereto, and mechanism operative to impart simultaneous trimming movements to said means relative to said members and simultaneous movements to said members.

9. The combination with a grindingwheel, of a set of movable members, wheeltrimming means carried by said members and capable of trimming movements relative thereto, the axes of said members and means being parallel, and mechanism automatically operative to intermittently impart trimming movements to said means relative to said members and simultaneous movements to said members.

10. The. combination with a grinding medium, of a lever, trimming means journaled in said lever,-means' for oscillating said trimming means relative to the lever, and means for moving the lever when the trimming means is oscillated relative thereto.

11. The combination with a grindingwheel. of a set of levers, a templet associated with such levers to control their movements, trimmer means carried by said levers for operating on opposed portions of the wheel, and mechanism for imparting trimming movements to said means relative to the levers and movement to the templet whereby the trimmer means have irregular movements. i k

12. The combination with a grindingwheel, of a set of movable members, rockshafts carried by said members, wheeltrimming means carried by such shafts and adapted to operate on opposed surfaces of the wheel, a templet carrying part, a templet removably carried by such part and coacting with said members, and mechanism intermittently operative to rock said shafts and simultaneously move the templet carrying part and templet to move said members.

13. The combination with grindingwheel, of separate trimming means for successively acting on the wheel to trim its operative portion, and mechanism operative to impart compound oscillatory movements to one of said means and reciprocatory,

movements to the other of said means. 1

1%. The combination with the grindingwheel, of a horizontally movable member,

' trimming means carried by said member, means movable to effect a movement of said member and a consequent movement of the trimmer means across the periphery of the wheel and means for automatically imparting intermittent movements to said second mentioned means.

15. The combination with a grindingwheel,

wheel,- of a horizontally movable bar, a

trimmer part carried by said bar and movable across the periphery of the wheel by a movement of such bar, mechanism for automatically imparting intermittent trimming movements to said bar and trimmer part, and means for retractingthe bar after said part acts on the Wheel.

16. The combination with a grindingwheel, of a movable member, a trimmer part adjustably carried by said member and a movable thereby across the periphery of the wheel, and means for automatically moving said member to communicate a trimming movement to the trimmer part.

'17. The combination with a grinding- Witnesses i Gno. P. Own, 0. M. MATTHEWS. I

of a reciprocatory member, a trimmer 'part adjustably carried by said member, 

